Yup that's bad but still why $308,why so much increase in price.Havent heard the ST-10S.
But I did just notice that they posted a graph:
So it might be more of a tuning problem rather than the vent system itself. That bass shelf is too big and too early. The dip at 1.5k and the bigger rise at around 2k is a problem as well....
Forget about cables. That's bad habit to add 2nd cable and add + $100